Laser implosion of 87-bar neon-filled glass microballoon targets produces a dense, cool plasma whose development in time and space is recorded by pulsed-x-ray shadowgraphy with soft x rays from a separate laser-produced plasma. Compressed densities of 4 g cm^-3 are estimated from the data by comparison with numerical simulations of the implosion.
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Key et al. (1978) studied this question.
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